Pencil-sharpener.



PATENTED SEPT. 25, 1906.

H. F. HAMBRUGH.

PENCIL SHARPENER.

APPLICATION FILED JAN. 1s, 190e.

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No. 831,861. PATENTED SEPT. 25, 1906.

H. F. HAMBRUGH.

PENCIL SHARPENER.`

APPLICATION FILED JAN. 16, 1906.

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UNTTED STATES PATENT OFFICE.

HEINRICH FRIEDRICH HAINIBRUCH, OF HAMBURG, GERMANY, ASSIGNOR OF ONE-HALFTO FRANZ IVILHELM GEORGE HARRY FISCHER, OF

HAMBURG, GERMANY.

PENCIL-SHARPENER.

Specification of Letters Patent.

Patented Sept. 25, 1906.

This invention relates to improvements in i machines for sharpeningpencils and the like and the object 1s to construct a machine which willspeedily and economically sharpenv a pencil.

The invention consists in means for rotating and gradually 'feeding thepencil against a rotating drum or disk which is provided on itsperiphery with cutting means, and, further, in constructing this disk soas to allow for easily redressing its cutting means-that is, forsharpening the same.

In the drawings, in which two modifications are shown,similar lettersrefer to similar parts.

In Figure I a side view of the machine is shown, partly in section. Fig.2 shows an end view, partly in section, and Fig. 3 a top view. In Fig. 4a side view, and in Fig. 5 an end view, of a modilication is shown,partly in section.

The machine is supported in a frame A, to which a pivot-pin a ishorizontally attached. This pin is surrounded by a sleeve a', carrying acutting disk or drum l) and a toothwheel d, gearing with a pinion f, theshaft c of which is j ournaled in a small movable frame m. This frame mis pivotally attached to the main frame A by a pin z and is providedwith a socket i, into which the pencil to be sharpened is placedl Aspiral spring h bears with one end against a lug 7L on the main frame Aand with its other end against a lug h2 on the movable frame m, thustending to force the latter downward and the point of the pencil againstthe cutting-surface of the disk or drum b. This cuttingsurface may beobtained by covering the periphery of the disk with any cuttingmaterial, such as emery, glass, flint, sandpaper, perforated sheetmetal, (steek) knife-blades, &c. To the shaft c a worm e is iixed, thehelical thread of which has a gripping edge contacting with the pencil,so as to rotate and at the same time feed the pencil forward when theworm is turning. This is done by means of a handle g, attached to thedisk b, the rotation of which is transported to the shaft c of the worme by the gearings d andf. In contacting with the pencil the sharp orgripping edge of the worm-thread partly enters the material of thepencil, thus securing a good grip on the same.

To prevent the point of the pencil from breaking, a plate Z is attachedadjustably to the frame m. If the disk is of the shape of a drum,provision may be made to shift it axially on the sleeve d, so as tobring a new part of the surface opposite the pencil when the part in useis worn out or has become blunt. This adjusting may be done by providingthe sleeve a with an outer and the boss of the disk I) with an innerthread and by arranging Va lock-nut B on the sleeve a for rigidlylocking the disk b to the sleeve a when the adjusting is carried out.Should it be desired to operate upon several pencils or the like at thesame time, one beside the other, the worm is to be made of a suitablelength, and a corresponding number of sockets i would have to befastened to the frame m.

In the modification shown in Fig. 4 the disk b is of the shape of acircular cutter or saw, which easily can be sharpened similar to anordinary saw. This cutter-disk may be made of steel plate and ispreferably rigidly attached to the sleeve a2. It is about of such smallbreadth as may correspond with the contact-surface of the pencil. Thesocket i2 has a thicker wall than in the first-shown construction and isprovided with a slot into which the cutter b projects, thus forming aguide for the same. In this modification the frame m may be rigidlyattached or, if desired, adjustably attached to the main frame A, in thelatter instance for permittinfr an adjustment of the position ofthepencil when the teeth of the cutter are worn out and shortened bysharpening. The teeth are so directed that the cutter may rotate in thedirection of the arrow.

The frame fm, forming the pencil-holder, is attached to the main frameby means of a screw z.

I claiml. A pencil-Sharpener comprising a worm for rotating and feedingthe pencil, the thread of which worm having a sharp edge for partlyentering the material of the pencil IOC -in combination With a rotatablecutter against the periphery of which the pencil bears.

2. A pencil-sharpener comprising a Worm directly engaging the pencil forrotating and feeding the same and a frame on which the shaft carryingsuch Worm is journaled and Which is provided With a socket for carryingand guiding the pencil in combination With a rotatable cutter againstthe periphery of which the pencil bears.

3. A pencil-sharpener comprising a Worm directly engaging the pencil forrotating and feeding the same and a movable frame on Which the shaftcarrying the Worm is journaled and which is provided With a socketforcarrying and guiding the pencil in combination with a rotatablecutter and a spring tending to force the movable frame in such directionas to press the pencil against the periphery of the cutting-disk.

4. A pencil-Sharpener comprising a Worm for rotating and feeding thepencil and a rotatable cutting-disk of small breadth having 25 j teethonits periphery for operating upon the point of the pencil, When thelatter is fed and rotated.

5. In a pencil-Sharpener, the combination of a rotatable member having aperipheral 3o i abrading-surface7 a Worm adapted to rotate and feed thepencil and means for preventing lateral displacement of the latter.

6. yIn a pencil-Sharpener the combination With a main frame and arotatable member 3 5 in the last-named frame directly engaging 4o thepencil.

HEINRICH FRIEDRICH HAMBRUCH.

Witnesses:

MAX KAEMPFF, OTTO WV. HELLMRICH.

